Lesson 1 of 7
What forces do
Goal: Describe what forces can do and how they are measured.
A force is a push or a pull. You cannot see a force, but you can see what it does.
Swipe to see three things a force can do.
Change speed
A kick makes a still ball move.
Forces can also speed things up, slow them down or stop them.
Change direction
The racket sends the ball back the way it came.
Change shape
A squeeze squashes the sponge.
Forces can also stretch, bend or twist things.
Forces are measured in newtons (N), with a newton meter.
Your turn
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Key words in this lesson
Force A push or a pull
Newton The unit of force
Newton meter Measures the size of a force